Introduction to the Leaning Tower of Pisa: The Leaning Tower of Pisa is the bell tower of the Pisa Cathedral. It is an eight-story cylindrical stone tower with a base diameter of 16 meters and a height of 55 meters. When it was first built in 1174, the third floor was tilted and construction was stopped several times. When it was completed in 1390, the center point of the 55-meter-high tower top had already deviated from the vertical line by 2.1 meters. It has deviated by more than 5 meters today. But it still leans without leaning, becoming a famous leaning tower and tourist attraction in the world.